Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
1
Specifications subject to change without notice. 1/01A
Low Capacitance
Plastic Packaged PIN Diodes
Features
s
Designed for High Performance Wireless
Switch Applications
s
0.25 pF Capacitance Specified
s
Multiple Package Configurations
s
Available in Tape and Reel Packaging
Description
The SMP1321 series of plastic packaged, surface
mountable PIN diodes are designed for high volume switch
applications from 10 MHz to beyond 2 GHz. The low
capacitance of these diodes (0.25 pF) combined with its low
resistance (2.0
maximum at 10 mA) make the SMP1321
series particularly suited to high isolation series connected
PIN diode switches in battery operated circuits. Available
in a selection of plastic packages and in a variety of
configurations including a low inductance (0.4 nH) SOT-23
(SMP1321-007), the small footprint SC-79 and the
miniature SC-70.
SMP1321 Series
Parameter
Condition
Typ.
Max.
Unit
Reverse Current (I
R
)
V
R
= 100 V
10
A
Capacitance (C
T
)
F = 1 MHz, V = 30 V
0.25
pF
Resistance (R
S
)
F = 100 MHz, I = 1 mA
3.0
Resistance (R
S
)
F = 100 MHz, I = 10 mA
2.0
Forward Voltage (V
F
)
IF = 10 mA
0.85
V
Carrier Lifetime (TI)
IF = 10 mA
0.4
S
I Region Width
15
m
Electrical Specifications at 25C
Characteristic
Value
Reverse Voltage (V
R
)
100 V
Power Dissipation @ 25C Lead
250 mW
Temperature (P
D
)
Storage Temperature (T
ST
)
-65C to +150C
Operating Temperature (T
OP
)
-65C to +150C
ESD Human Body Model
Class 1B
Absolute Maximum Ratings
Single
Common Common
Series
Pair
Low
Single
Single
Anode
Cathode
Inductance
Marking: PM1
Marking: PM9
Marking: PM3
Marking: PM2
Marking: PMB
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOD-323
SC-79
o
SMP1321-001
o
SMP1321-003
o
SMP1321-004
o
SMP1321-005
o
SMP1321-007
o
SMP1321-011
o
SMP1321-079
L
S
= 1.5 nH
L
S
= 1.5 nH
L
S
= 1.5 nH
L
S
= 1.5 nH
L
S
= 0.4 nH
L
S
= 1.5 nH
L
S
= 0.7 nH
SC-70
SC-70
SC-70
o
SMP1321-073
o
SMP1321-074
o
SMP1321-075
L
S
= 1.4 nH
L
S
= 1.4 nH
L
S
= 1.4 nH
o
Available through distribution.
2
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
Specifications subject to change without notice. 1/01A
Low Capacitance Plastic Packaged PIN Diodes
SMP1321 Series
Series Resistance vs. Current @ 100 MHz
0.01
0.1
1
10
100
Forward Current (mA)
Series Resistance (
)
0.1
1
10
100
0
1
2
5
10
20
50
Capacitance vs. Reverse Voltage
0
0.2
0.1
0.4
0.6
0.5
0.3
0.8
0.7
Reverse Voltage (V)
Capacitance (pF)
1 MHz1 GHz
400
500
600
700
800
900
1000
DC Characteristic
0.01
0.1
1
10
100
Forward Voltage (mV)
Forward Current (mA)
0
500
1000
1500
2000
Conductance vs. Frequency
and Reverse Voltage
Frequency (MHz)
Conductance (
S)
0 V
10 V
40 V
0
100
200
300
400
500
600
700
800
Typical Performance Data
R
R
R
R
R
I
F
-55C
-15C
+25C
+65C
+100C
(mA)
(
)
(
)
(
)
(
)
(
)
0.02
47.400
50.000
56.300
61.500
65.100
0.10
12.000
12.600
13.900
15.400
16.400
0.30
5.200
5.400
5.800
6.400
6.900
0.50
3.600
3.800
4.100
4.500
4.800
1.00
2.400
2.500
2.600
2.800
3.100
10.00
1.030
1.040
1.040
1.070
1.150
20.00
0.871
0.888
0.873
0.889
0.956
100.00
0.669
0.659
0.642
0.645
0.695
Resistance vs. Temperature @ 500 MHz
SMP1321-007
In the -007 configuration of the SOT-23 package, the package
inductance is effectively reduced to 0.4 nH, in comparison to
the 1.5 nH value of the standard configuration. This lower
inductance will be particularly beneficial when the diodes are
used as shunt connected switches at frequencies higher than
500 MHz, where inductance is the primary limitation on
maximum switch isolation.
To achieve the effective 0.4 nH, the SOT-23 package must
be inserted in the microstrip circuit board with a gap in the
trace, as shown in the
figure. Because of the
polarity of the diode
junction, this low inductance
feature is only realizable with
the cathode connected to
ground.
Ground
Gap
Low Capacitance Plastic Packaged PIN Diodes
SMP1321 Series
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
3
Specifications subject to change without notice. 1/01A
SOT-23
3
2
1
0.035 (0.89 mm) MIN.
0.044 (1.12 mm) MAX.
0.0005 (0.01 mm) MIN.
0.004 (0.10 mm) MAX.
0.012 (0.30 mm) MIN.
0.020 (0.50 mm) MAX.
0.003 (0.080 mm) MIN.
0.008 (0.20 mm) MAX.
8 MAX.
0.022 (0.55 mm) REF.
0.110 (2.80 mm) MIN.
0.120 (3.04 mm) MAX.
0.083 (2.10 mm) MIN.
0.104 (2.64 mm) MAX.
0.037 (0.95 mm) REF.
0.047 (1.20 mm) MIN.
0.055 (1.40 mm) MAX.
0.076 (1.92 mm) REF.
0.020 (0.51 mm) REF.
SOD-323
0.090 (2.30 mm) MIN.
0.108 (2.74 mm) MAX.
0.045 (1.15 mm) MIN.
0.053 (1.35 mm) MAX.
0.050
(1.25 mm) MAX.
0.006
(0.15 mm) TYP.
0.008 (0.20 mm) NOM.
0.004 (0.10 mm) MAX.
0.010 (0.25 mm) MIN.
0.010
(0.25 mm) MIN.
0.016
(0.40 mm) MAX.
0.063 (1.60 mm) MIN.
0.071 (1.80 mm) MAX.
CATHODE
INDICATOR
2
1
SC-79
0.060 (1.50 mm) MIN.
0.067 (1.70 mm) MAX.
0.010
(0.25 mm) MIN.
0.014
(0.35 mm) MAX.
0.043 (1.10 mm) MIN.
0.051 (1.30 mm) MAX.
0.020
(0.50 mm) MIN.
0.028
(0.70 mm) MAX.
0.003
(0.07 mm) MIN.
0.008
(0.20 mm) MAX.
10 MAX.
10 MAX.
0.028
(0.70 mm) MIN.
0.035
(0.90 mm) MAX.
0.006 (0.15 mm) MIN.
CATHODE
INDICATOR
1
2
SC-70
3
2
1
0.031 (0.80 mm) MIN.
0.039 (1.00 mm) MAX.
0.000 (0.00 mm) MIN.
0.004 (0.10 mm) MAX.
0.010 (0.25 mm) MIN.
0.016 (0.40 mm) MAX.
0.071 (1.80 mm) MIN.
0.087 (2.20 mm) MAX.
0.071 (1.80 mm) MIN.
0.094 (2.40 mm) MAX.
0.045 (1.15 mm) MIN.
0.053 (1.35 mm) MAX.
0.026 (0.65 mm) REF.
0.051 (1.30 mm) REF.
0.004 (0.10 mm) MIN.
0.007 (0.18 mm) MAX.
0.004 (0.10 mm) MIN.
0.012 (0.30 mm) MAX.
0.014 (0.35 mm) REF.
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